Chemistry Class 9 Chapter 3 Important MCQs Federal Board
Chemistry Class 9 Chapter 3 Important mcqs Federal Board Periodic Table and Periodicity of Properties Important Multiple Choice Questions 1) Total number of periods in the periodic table are ___. A) 7 B) 8 C) 11 D) 10 Answer: A (7) 2) An element whose last electron enters into s-subshell is a ___ block element. …
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